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Running a 22LR conversion bolt in a centerfire barrel gets the job done, but a barrel cut specifically for rimfire is a different animal. This CMMG sub-assembly is the foundation for a true dedicated 22LR upper, giving you tighter chamber tolerances and a bore designed around the .22 round instead of forcing it through a .223 barrel. The M4 profile duplicates the look and balance of a standard carbine, so training and plinking feel like the real thing.
The blank starts as 4140 chrome moly steel, then gets a salt bath nitride treatment inside and out. That finish fights corrosion, cuts down on cleaning headaches, and stands up to the high round counts a rimfire plinker tends to rack up. The 1:16 twist is dialed in for stabilizing standard 22LR loads, and the 16.1" length keeps the overall build compact and lively in the hand. It comes threaded 1/2-28 at the muzzle with a .750" carbine-length gas journal, so it plays nice with the muzzle devices and low-profile gas blocks already in your parts bin.
This is a barrel sub-assembly, not a drop-in complete upper, so plan on adding a stripped upper receiver, handguard, a CMMG 22LR bolt group, a compatible magazine, and your muzzle device of choice to finish the build. The payoff is a rifle that shoots for pennies compared to 5.56 while keeping the same manual of arms as your duty or range gun. For accuracy, shooters tend to report best results with quality copper-plated ammo like CCI Mini-Mag rather than bargain-bin bulk, and the tighter rimfire chamber rewards you with noticeably better groups over a conversion setup. Whether you're teaching a new shooter, burning through a brick on a Saturday, or just want cheap trigger time, this is the honest starting point for a rimfire AR that earns its keep.
This is a barrel sub-assembly only, meaning you're getting the barrel to build around. To finish a working dedicated 22LR upper you'll still need a stripped upper receiver, a handguard, a CMMG 22LR bolt group, a magazine, and a muzzle device. It's meant for builders putting together a custom rimfire upper from parts.
A dedicated rimfire barrel has a chamber and bore cut specifically for 22LR instead of routing the round through a centerfire .223 barrel. That tighter fit generally delivers noticeably better accuracy, and it keeps dirty rimfire fouling out of your dedicated centerfire barrel. For a rifle you plan to shoot a lot, the dedicated route tends to be the more satisfying setup.
The 1:16 twist is built to stabilize standard 22LR loads, and quality copper-plated ammo like CCI Mini-Mag is a common favorite for reliable cycling and tighter groups. Cheap waxy bulk ammo can run dirtier and less consistently. Sticking with decent plated rounds will get you the best performance out of this barrel.
Yes. It uses a .750" carbine-length gas journal, so standard low-profile gas blocks fit right on, and the muzzle is threaded 1/2-28 for common 22LR and AR-15 muzzle devices. You should be able to use parts you already have on hand for most builds.
| UPC | 815835014722 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 22D7C0A |
| Shipping Weight | 2.045 |
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